soc/intel/quark/Kconfig: don't unselect CPU_X86_LAPIC

The Intel Quark SoC does have a LAPIC on its x86 CPU core, so we should
select CPU_X86_LAPIC. This will additionally include the Makefile from
cpu/x86/lapic. Since none of AP_IN_SIPI_WAIT, LEGACY_SMP_INIT and
UDELAY_LAPIC gets selected, only the boot_cpu.c and lapic.c targets will
be added to the build. Since SMP isn't set, adding the boot_cpu.c target
won't change the resulting binary of a timeless build, since the only
function inside will be removed by the compiler's pre-processor in the
!SMP case. So the only thing that will change the resulting binary is
the addition of the lapic.c target. From this target only the function
cpu_get_lapic_addr will be used which overrides the weak implementation
in acpi/acpi.c. The call in arch/x86/mpspec.c can be ignored, since
GENERATE_MP_TABLE isn't selected. So this change will result in the
LAPIC address in the MADT being changed from 0 to to LAPIC_DEFAULT_BASE.
Since the documentation of the Quark SoC mentions that it has a LAPIC on
its one x86 core, this should work.

TEST=None

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I2f163bd608f0548abb0e8de90843d2a796b8ef6c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58550
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/quark/Kconfig

@@ -24,10 +24,6 @@ config CPU_SPECIFIC_OPTIONS
 	select USE_MARCH_586
 	select NO_SMM
 
-config CPU_X86_LAPIC
-	bool
-	default n
-
 #####
 # Debug serial output
 #     The following options configure the debug serial port